The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jun. 15, 1999
Filed:
Dec. 20, 1996
Francis Pinault, Bois Colombes, FR;
Alcatel Mobile Phones, Paris, FR;
Abstract
A terminal of a cellular mobile radio system cooperates with a user card and is able to operate in at least two separate operating modes, namely a normal mode in which it can be used with any user card and a locked mode in which it can be used only with the user card to which it is locked, the latter constituting a linked user card. To make use of the terminal more secure, first locking data is stored in a memory area of the linked user card and, in the locked mode, the method includes a phase of authentication by the terminal of the user card with which it is cooperating. In the authentication phase second locking data is calculated in the terminal from the intermediate data read in a memory area accessible to the terminal using a calculation function specific to the terminal, and the first and second locking data is compared in the terminal and use of the terminal is authorized only in the event of equality, that is to say if the user card with which the terminal is cooperating is authenticated as the linked user card.